As ESPN.com recently noted, Blue did a nice job in relief of Foster last season. A sixth-round pick out of LSU, Blue became the only player in franchise history to score touchdowns rushing, receiving and returning (when he returned a blocked punt for a touchdown). Meanwhile, Foster is still a dynamic running back, but with each passing day, the need to manage his health becomes more and more important. He turns 29 in August and missed three full games last season and parts of three others due to injuries. So Blue is the natural handcuff -- at least heading into training camp. The Texans also added former Eagle Chris Polk to the mix. Polk is likely to compete with Blue and Jonathan Grimes for that No. 2 spot. Polk rushed for 172 yards and four touchdowns on 46 carries for Philadelphia in 2014. Buried on the depth chart in Philadelphia, the move to Houston gives him a chance to push Blue for that backup role. Watch before investing.